P1625
PCM System Reset
2004-2007 Buick Rainier 4.2L I6
High SeverityPowertrain
Description
The PCM has experienced an unexpected reset during operation. This can indicate a power supply issue or internal PCM fault.
Symptoms
- Check Engine Light
- Engine momentary stumble
- Loss of adaptive data
- Multiple codes may be stored
Common Causes
- Intermittent power supply to PCM
- Loose PCM connector
- Internal PCM failure
- Low battery voltage
- Ignition switch issue
Diagnostic Steps
- Check all PCM power and ground circuits
- Inspect PCM connectors
- Test battery and charging system
- Monitor PCM power with oscilloscope for dropouts
- Check ignition switch
Repair Notes
Check PCM power and ground connections. Verify battery and charging system. Replace PCM if internal fault confirmed.
Related Codes
P1600ECM Battery Backup CircuitP1600PCM Battery Direct Power CircuitP1600Loss of KAM Power — Open CircuitP1600PCM Battery Direct Power CircuitP1600Loss of KAM Power — Open CircuitP1600Loss of KAM Power Circuit OpenP1600PCM Battery Direct Power CircuitP1600ECM Battery Backup CircuitP1600ECM Battery Backup CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600Loss of KAM Power — Open CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1600PCM Battery Direct Power CircuitP1621PCM Memory Performance (Long Term Memory Error)P1621PCM Memory Performance (Long Term Memory Error)P1621PCM Memory Performance (Long Term Memory Error)P1621PCM Memory Performance (Long Term Memory Error)P1621PCM Memory Performance (Long Term Memory Error)P1621PCM Memory Performance (Long Term Memory Error)P1621PCM Memory Performance (Long Term Memory Error)P1621PCM Memory Performance (Long Term Memory Error)P1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633Keep Alive Power Voltage Too LowP1633Ignition Supply Power Circuit Low VoltageP1633ECM Malfunction ETCS CircuitP1633Ignition Supply Power Circuit Low VoltageP1633Ignition Supply Power Circuit Low VoltageP1633ECM Malfunction ETCS CircuitP1633Keep Alive Power Voltage Too LowP1633KAM Voltage Too LowP1633Ignition Supply Power Circuit Low VoltageP1633Keep Alive Power Voltage Too LowP1633ECM Malfunction ETCS CircuitP1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Charging System Voltage LowP1682Charging System Voltage LowP1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Ignition 1 Switch Circuit 2 (Driver 5 Line 2)P1682Charging System Voltage LowP1682Charging System Voltage Low
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1625 on Other Vehicles
Common Questions
What does code P1625 mean on a 2004-2007 Buick Rainier?
P1625 stands for "PCM System Reset". The PCM has experienced an unexpected reset during operation. This can indicate a power supply issue or internal PCM fault.
What are the symptoms of P1625 on a Buick Rainier?
Common symptoms of P1625 include: Check Engine Light, Engine momentary stumble, Loss of adaptive data, Multiple codes may be stored.
What causes P1625 on a 2004-2007 Buick Rainier?
Common causes of P1625 include: Intermittent power supply to PCM, Loose PCM connector, Internal PCM failure, Low battery voltage, Ignition switch issue.